# Problem in HF Analysis

**URL:** <https://alice-talk.web.cern.ch/t/problem-in-hf-analysis/1390>\
**Category:** O2 Analysis\
**Created:** [December 1, 2022, 1:30pm UTC](https://alice-talk.web.cern.ch/t/problem-in-hf-analysis/1390 "2022-12-01T13:30:05Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ypatley](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/y/eb8c5e/32.png) [@ypatley](https://alice-talk.web.cern.ch/u/ypatley)\
**Post date:** [December 1, 2022, 1:30pm UTC](https://alice-talk.web.cern.ch/t/problem-in-hf-analysis/1390/1 "2022-12-01T13:30:06Z")

</div>

I am trying to run the tutorial from the following link…

> <https://github.com/AliceO2Group/analysis-tutorials/blob/master/o2at-1/h4/o2at-h4-1-skimming.cxx>

I am able to compile it with ninja.  
But when I am executing it in the directory with AO2D-HF.root, it is showing me the following error at last…  
[ERROR] SEVERE: Device hf-track-index-skim-creator (46352) had at least one message above severity 4: Got nullptr from CCDB for path GLO/Config/GRPMagField and timestamp 1547167250113

Kindly help me with this !!!